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AT&H Clock Control
The &H command determines when clocks will be applied to the ‘RxC’ RS- 232 signal.
With &H0 selected, the RxC signal will be active whenever a synchronous mode is selected.
With &H1 selected, the clock will only be present after a connection has been established to
another modem.
Options
AT&H0 ■ Clock always present in synchronous mode
AT&H1 Clock only appears after connection
Range
0-1